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hi! I am an owner of an urbanglide 140 14inc wheel which has an 250w hubmotor and a 36v 6Ah battery with only 25km/h top speed. So I decided to upgrade it with an other controller s866 and an other battery 48v and 17.5h. after that the top speed should be more than 30km/h but it still 25-26km/h...